482d241936
Go's SSA instructions only operate on registers. For example, an add instruction would read two registers, do the addition and then write to a register. WebAssembly's instructions, on the other hand, operate on the stack. The add instruction first pops two values from the stack, does the addition, then pushes the result to the stack. To fulfill Go's semantics, one needs to map Go's single add instruction to 4 WebAssembly instructions: - Push the value of local variable A to the stack - Push the value of local variable B to the stack - Do addition - Write value from stack to local variable C Now consider that B was set to the constant 42 before the addition: - Push constant 42 to the stack - Write value from stack to local variable B This works, but is inefficient. Instead, the stack is used directly by inlining instructions if possible. With inlining it becomes: - Push the value of local variable A to the stack (add) - Push constant 42 to the stack (constant) - Do addition (add) - Write value from stack to local variable C (add) Note that the two SSA instructions can not be generated sequentially anymore, because their WebAssembly instructions are interleaved. Design doc: https://docs.google.com/document/d/131vjr4DH6JFnb-blm_uRdaC0_Nv3OUwjEY5qVCxCup4 Updates #18892 Change-Id: Ie35e1c0bebf4985fddda0d6330eb2066f9ad6dec Reviewed-on: https://go-review.googlesource.com/103535 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com> |
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The Go Programming Language
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